/*
 * This file is part of Applied Energistics 2. Copyright (c) 2013 - 2015, AlgorithmX2, All rights reserved. Applied
 * Energistics 2 is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General
 * Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any
 * later version. Applied Energistics 2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
 * Public License for more details. You should have received a copy of the GNU Lesser General Public License along with
 * Applied Energistics 2. If not, see <http://www.gnu.org/licenses/lgpl>.
 */

package appeng.core.worlddata;

import java.util.Map;
import java.util.UUID;

import javax.annotation.Nonnull;

import net.minecraftforge.common.config.ConfigCategory;

import com.google.common.base.Optional;
import com.google.common.base.Preconditions;

/**
 * Wrapper class for the player mappings. Will grant access to a pre initialized player map based on the "players"
 * category in the settings.cfg
 */
final class PlayerMapping implements IWorldPlayerMapping {

    /**
     * View of player mappings, is not immutable, since it needs to be edited upon runtime, cause new players can join
     */
    private final Map<Integer, UUID> mappings;

    public PlayerMapping(final ConfigCategory category) {
        final PlayerMappingsInitializer init = new PlayerMappingsInitializer(category);

        this.mappings = init.getPlayerMappings();
    }

    @Nonnull
    @Override
    public Optional<UUID> get(final int id) {
        final UUID maybe = this.mappings.get(id);

        return Optional.fromNullable(maybe);
    }

    @Override
    public void put(final int id, @Nonnull final UUID uuid) {
        Preconditions.checkNotNull(uuid);

        this.mappings.put(id, uuid);
    }
}
